【布隆过滤器】基于Resisson的实现的布隆过滤器

　　　　<!-- redis -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <!-- redisson -->
        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson</artifactId>
        </dependency>    

　　　　<!-- springbootb版本 -->
　　　　 <dependency>

    　　　　 <groupId>org.springframework.boot</groupId>

    　　　　 <artifactId>spring-boot-starter-parent</artifactId>
    　　　　 <version>2.2.6.RELEASE</version>
　　　　
       </dependency>

import org.redisson.api.RBloomFilter;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.function.Predicate;

/**
 * @author Sam.yang
 * @since 2021/7/30 10:10
 */
@Configuration
public class RedissonBloomFilterConfig {

    /**
     * 初始化设备信息布隆过滤器
     *
     * @param redissonClient {@link RedissonClient}
     * @return {@link RBloomFilter}
     */
    @Bean
    public RBloomFilter<String> getNnPcDeviceBloomFilter(@Autowired RedissonClient redissonClient) {
        //获取布隆过滤器
        RBloomFilter<String> nnPcDeviceFilter = redissonClient.getBloomFilter(CacheConstant.BLOOM_FILTER_DEVICE_CONSTANT);
        Predicate<RBloomFilter> predicate = rBloomFilter -> !nnPcDeviceFilter.isExists();
        //初始化布隆过滤器，注意这里必须要初始化，否则在使用的时候，会报错未初始化布隆过滤器，初始值5000000 是一个经验值，根据业务场景设置
        if (predicate.test(nnPcDeviceFilter)) {
            nnPcDeviceFilter.tryInit(5000000, 0.03);
        }
        return nnPcDeviceFilter;
    }

}

    @Autowired
    @Qualifier(value = "getNnPcDeviceBloomFilter")
    private RBloomFilter<String> nnPcDeviceBloomFilter;

       exist = nnPcDeviceBloomFilter.contains(deviceId);
        if (!exist) {
         //业务逻辑，这里省略***********
        }